[PATCH v2 02/16] migration/rdma: Unfold ram_control_before_iterate()

[Juan Quintela]

Once there:
- Remove unused data parameter
- unfold it in its callers.
- change all callers to call qemu_rdma_registration_start()

Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/qemu-file.c | 13 +------------
 migration/qemu-file.h |  2 --
 migration/ram.c       | 16 +++++++++++++---
 migration/rdma.c      |  8 +++++---
 migration/rdma.h      |  6 ++++++
 5 files changed, 25 insertions(+), 20 deletions(-)

diff --git a/migration/qemu-file.c b/migration/qemu-file.c
index ee04240a21..b6dca23706 100644
--- a/migration/qemu-file.c
+++ b/migration/qemu-file.c
@@ -30,6 +30,7 @@
 #include "qemu-file.h"
 #include "trace.h"
 #include "qapi/error.h"
+#include "rdma.h"
 
 #define IO_BUF_SIZE 32768
 #define MAX_IOV_SIZE MIN_CONST(IOV_MAX, 64)
@@ -314,18 +315,6 @@ void qemu_fflush(QEMUFile *f)
     f->iovcnt = 0;
 }
 
-void ram_control_before_iterate(QEMUFile *f, uint64_t flags)
-{
-    int ret = 0;
-
-    if (f->hooks && f->hooks->before_ram_iterate) {
-        ret = f->hooks->before_ram_iterate(f, flags, NULL);
-        if (ret < 0) {
-            qemu_file_set_error(f, ret);
-        }
-    }
-}
-
 void ram_control_after_iterate(QEMUFile *f, uint64_t flags)
 {
     int ret = 0;
diff --git a/migration/qemu-file.h b/migration/qemu-file.h
index d16cd50448..c898c5c537 100644
--- a/migration/qemu-file.h
+++ b/migration/qemu-file.h
@@ -56,7 +56,6 @@ typedef size_t (QEMURamSaveFunc)(QEMUFile *f,
                                  uint64_t *bytes_sent);
 
 typedef struct QEMUFileHooks {
-    QEMURamHookFunc *before_ram_iterate;
     QEMURamHookFunc *after_ram_iterate;
     QEMURamHookFunc *hook_ram_load;
     QEMURamSaveFunc *save_page;
@@ -150,7 +149,6 @@ void qemu_fflush(QEMUFile *f);
 void qemu_file_set_blocking(QEMUFile *f, bool block);
 int qemu_file_get_to_fd(QEMUFile *f, int fd, size_t size);
 
-void ram_control_before_iterate(QEMUFile *f, uint64_t flags);
 void ram_control_after_iterate(QEMUFile *f, uint64_t flags);
 void ram_control_load_hook(QEMUFile *f, uint64_t flags, void *data);
 
diff --git a/migration/ram.c b/migration/ram.c
index 7d81c4a39e..ce5dfc3c86 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -58,6 +58,7 @@
 #include "qemu/iov.h"
 #include "multifd.h"
 #include "sysemu/runstate.h"
+#include "rdma.h"
 #include "options.h"
 
 #include "hw/boards.h" /* for machine_dump_guest_core() */
@@ -3277,7 +3278,10 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
         }
     }
 
-    ram_control_before_iterate(f, RAM_CONTROL_SETUP);
+    ret = qemu_rdma_registration_start(f, RAM_CONTROL_SETUP);
+    if (ret < 0) {
+        qemu_file_set_error(f, ret);
+    }
     ram_control_after_iterate(f, RAM_CONTROL_SETUP);
 
     migration_ops = g_malloc0(sizeof(MigrationOps));
@@ -3337,7 +3341,10 @@ static int ram_save_iterate(QEMUFile *f, void *opaque)
         /* Read version before ram_list.blocks */
         smp_rmb();
 
-        ram_control_before_iterate(f, RAM_CONTROL_ROUND);
+        ret = qemu_rdma_registration_start(f, RAM_CONTROL_ROUND);
+        if (ret < 0) {
+            qemu_file_set_error(f, ret);
+        }
 
         t0 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
         i = 0;
@@ -3442,7 +3449,10 @@ static int ram_save_complete(QEMUFile *f, void *opaque)
             migration_bitmap_sync_precopy(rs);
         }
 
-        ram_control_before_iterate(f, RAM_CONTROL_FINISH);
+        ret = qemu_rdma_registration_start(f, RAM_CONTROL_FINISH);
+        if (ret < 0) {
+            qemu_file_set_error(f, ret);
+        }
 
         /* try transferring iterative blocks of memory */
 
diff --git a/migration/rdma.c b/migration/rdma.c
index b026e98519..d8a194ff26 100644
--- a/migration/rdma.c
+++ b/migration/rdma.c
@@ -3860,12 +3860,15 @@ static int rdma_load_hook(QEMUFile *f, uint64_t flags, 
void *data)
     }
 }
 
-static int qemu_rdma_registration_start(QEMUFile *f,
-                                        uint64_t flags, void *data)
+int qemu_rdma_registration_start(QEMUFile *f, uint64_t flags)
 {
     QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(qemu_file_get_ioc(f));
     RDMAContext *rdma;
 
+    if (!migrate_rdma()) {
+        return 0;
+    }
+
     RCU_READ_LOCK_GUARD();
     rdma = qatomic_rcu_read(&rioc->rdmaout);
     if (!rdma) {
@@ -4004,7 +4007,6 @@ static const QEMUFileHooks rdma_read_hooks = {
 };
 
 static const QEMUFileHooks rdma_write_hooks = {
-    .before_ram_iterate = qemu_rdma_registration_start,
     .after_ram_iterate  = qemu_rdma_registration_stop,
     .save_page          = qemu_rdma_save_page,
 };
diff --git a/migration/rdma.h b/migration/rdma.h
index de2ba09dc5..901c829c8b 100644
--- a/migration/rdma.h
+++ b/migration/rdma.h
@@ -22,4 +22,10 @@ void rdma_start_outgoing_migration(void *opaque, const char 
*host_port,
 
 void rdma_start_incoming_migration(const char *host_port, Error **errp);
 
+
+#ifdef CONFIG_RDMA
+int qemu_rdma_registration_start(QEMUFile *f, uint64_t flags);
+#else
+int qemu_rdma_registration_start(QEMUFile *f, uint64_t flags) { return 0; }
+#endif
 #endif
-- 
2.40.0